Custom Manual Pinch Valve, DN25-DN300, PN6/PN4, Rubber Sleeve

Product Name: Manual Pinch Valve
Design and Manufacturing Standard: MFG
Size Range: DN25-DN300, 1-12 Inch
Pressure Rating: PN6, PN4, Class 150 LB
Body Materials: Stainless Steel, Carbon Steel, Cast Iron, Aluminum Alloy, Plastic
Sleeve Materials: Natural Rubber
End Connection: Flanged
Operation: Manual
Medium: Slurry, Abrasive, Dust

What is Manual Pinch Valve?

Also known as a manual pinch valve, it is composed of a rubber hose, a small valve rod, upper and lower valve plates, a lever, a support frame, and handwheel components. It is designed to be corrosion-resistant, frost-resistant, and has good sealing performance. Simply replacing the rubber hose can restore the valve to its original condition, extending its lifespan to 4-6 times that of a standard valve. The drive methods include manual, pneumatic, electric, and various other options, and it can also be customized to meet specific customer requirements.

The manual pinch valve has a fixed position on the hose clamp, ensuring that the inner lining remains in place even after long periods of closure, allowing it to return to its original position and achieve full flow or full cut. The manual pinch valve is more suitable for adjusting the flow of fluids and can also be operated manually or with a handwheel for convenient selection of different drivers.

The valve is a full-bore valve with no gaps, and the tight parts or seats do not affect the operation of the valve. As shown in the figure, when abrasive particles hit the synthetic rubber surface, they are first absorbed and then bounce back. The elasticity and toughness of the synthetic rubber hose are much better than those of metal valves. The fatigue life of the rubber hose during the dynamic fatigue process under cyclic loads is also different. Research on NR rubber indicates that when the load ratio R (R is the ratio of the minimum load to the maximum load) increases, although the energy input decreases, the fatigue life of the sample increases. When R is negative, especially when R=-1, this corresponds to symmetrical tensile/compressive cyclic loading, and fatigue cracks will increase, and crystallization will not occur because crystallization occurs during the relaxation phase. At high load ratios (R=0.5), rubber crystallization occurs at the crack tip due to stress concentration or plastic deformation, preventing crack propagation.

For various loads and complex load situations, the fatigue life is more complex. Under tensile/compressive, tensile/stretch, and tensile/any cyclic loading conditions, the stress amplitude is not constant, and the loading sequence also greatly affects fatigue life. From low to high loads, fatigue life is much longer than from high to low loads. The degree of change in fatigue life reflects the tensile and compressive properties of the rubber hose, with higher tensile strength and lower compressive strength. The tensile fatigue life of the rubber hose is longer than its compressive fatigue life. The method for testing the fatigue life of the rubber hose is to first conduct a certain period of tensile fatigue test, then conduct a tensile and compression fatigue test, and finally measure the stress-strain curve on an electronic tensile testing machine to determine the tensile and compressive fatigue life of the rubber hose.

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